Casing head



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c, s. CLARKE cAsING- HEAD iled May 26, 1921 ATTORNEY To all whom it mayconcern:

Be it known that 1, Cum S. CLARKE, a citizen of the United States,residing at Shreveport, in the parish of Caddo and State of Louisiana,have invented new and useful Improvements in Casing Heads, of which thefollowing is a specification.

This invention relates to improvements in casing heads for use inconnection with oil wells.

An important object of the invention is the provision of hand grippingmeans to at tach to the upper face of well tube gripping segments.

Another object of the invention is the provision of novel form of slipsfor holding pipe suspended within the well, the particular formation andarrangement of the slips providing a 'gri which engages approximately'two-thir s of the circumference of the pipe and thus provides positivemeans for preventing the pipe from slipping downward.

Another object of the invention is the provision of means whereby theslips engage the pipe in a manner to provide a uniform pressure and thusprevent crushing or injury to the pipe, certain of the slips providing aback up grip which engages that portion of the pipes circumference, orthe remaining one-third not engaged by slips above mentioned.

A further object is the provision of a casing head in which the relativesize of the bore and the size of each individual slip is such as toprevent the latter from dropping through the head and thus guardsagainst loss and possible serious injury to the well;

With the above and other objects in view, the invention further includesthe following novel features and details of construction, to behereinafter more fully described, illustrated in the accompanyingdrawings and pointed out in the appended claims.

In the drawings Figure l is a vertical longitudinal sectional' viewshowing a casing head and pipe shown in connection therewith.

Figure 2 is a section on the line 2-2 of Figure 1 looking in thedirection of the arrow.

Figure 3 isa detail perspective view of the slip used for preventingrotary movement of the pipe.

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on snnnvnronr, LOUISIANA.

casme HEAD.

Application filed May 26, 1921. Serial No. 472,763.

Figure 4 is a perspective view of a slipv as threadedly mounted upon theupper end of a well casing 11. The head is provided with oppositelyarranged openings 12, while its bore is flared upwardly and outwardly toprovide an inclined surface 13, the lower end of this inclined surfaceforms the most restricted portion of the bore of the head and thediameter of this portion is preferably greater than the bore of thecasing 11. This is an important feature in casing head construction, inthat it permits the introduction of oil well fishing tools and otherequipment within'the casing, without removing the head. At its upper endthe hea is formed with an enlarged bore 14.

For the purpose of temporarily holding the pipe which is indicated at21, in position, there is associated with the head,

slips 22, 22 and 23. The slips 22 and 22 herein shown as two in numberare provided with transversely arranged serrations or teeth 24 and theseteeth are adapted-to surround and engage approximately two-thirds of thecircumference of the pipe to hold the same against downward movement.One of the novel features of these slips resides in coupling the slips22 and 22 by means of a handle or bail 25, which is pivotally secured toeach slip by means of upstanding ears 25 The handle provides means forsimultaneously positioning the slips 22 and 22 and as the latter engagethe pipe beyond each side of its center, an initial grip is providedupon the pipe prior to the insertion of a slip 23. Also, by coupling theslips 22 and 22 these are inserted so as to occupy the same relativepositions upon opposite sides of the pipe and thus aid in centering thepipe for the proper insertion of the slip 23. This last mentioned slipis provided with vertically arranged teeth or serrations 26, whichengage the pipe and act to prevent rotation of the latter when couplingor uncoupling the pipe sections. The slip 23 is preferably provided witha handle 2 by means of an upstanding ear 27.

changes in its form, proportions and minor details of construction andthe right is herein reserved to make such changes as propand adapted toclamp a well tube therebetween, alined upstanding ears carried by onepair of the gripping elements, a U- shaped member having its endspivotally connected with the ears, an upstanding ear carried by theremaining gripping segment,

and a finger engaging loop carried thereby.

3. The combination with a well casing head having a tapered bore, of aplurality of tapered well tube gripping segments received in the bore, amember pivotally connected with the upper faces of a plurality ofsegments, and a loop pivotally connected with the upper face of anothersegment.

In testimony whereof I afiix my signature.

CLEM S. CLARKE.

